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La Arena Mine
(
La Arena Sulphide expansion Project
)
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Location:
13 km SW from Huamachuco, Peru
Regional Office:
Ave. La Floresta 497 Of. 101 Charcarilla del Estanque San Borja, Lima 41
Lima
Peru
15037
...
+51-1-618-9729
Web
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Overview
Stage
Production
Mine Type
Open Pit
Commodities
Gold
Silver
Mining Method
Truck & Shovel / Loader
Production Start
...
La Arena is an open-pit, heap leach gold mine producing doré, where exploration success has extended the mine’s life.
A preliminary economic assessment (PEA) was released in February 2018 on the sulphide expansion, La Arena II.
Owners
Source:
p. 75
Company
Interest
Ownership
Pan American Silver Corp.
100 %
Indirect
Pan American has 100% ownership of the La Arena mine, through its wholly-owned Peruvian subsidiary La Arena S.A.
Contractors
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Deposit Type
Sandstone hosted
Porphyry
Epithermal
Summary:
Two types of mineralized deposits are recognized at the La Arena property – high-sulfidation epithermal gold deposits and porphyry-hosted copper-gold deposits. The epithermal gold deposits are hosted in sediments of the Lower Cretaceous Chimu Formation and the copper-gold deposit is hosed in Oligocene-age multi-stage intermediate intrusions.
Both deposits are characterized by alteration and mineralization occurrences as defined and described by Hedenquist (1987), Hedenquist and Lowenstern (1994), Arribas (1995) and Sillitoe (2010), among others. The epithermal gold deposit currently being mined is characterized by supergene oxidized high-sulfidation mineralization, which occurs in fractured sandstones and hydrothermal breccia zones. The porphyry deposit is dominated by primary copper sulfides with gold and lesser molybdenum.
High sulfidation epithermal gold deposits form in geothermal systems where hot acidic hydrothermal fluids emanate directly from an intrusive source and generally remain undiluted by ground water. As is the case at La Arena, these deposits often represent the upper parts of porphyry systems where the two types of mineralization often overlap. High-sulfidation deposits can display a wide variety of mineralization styles, including veins, hydrothermal breccias, stockwork, and disseminations or replacements.
In porphyry deposits, the sulfide ore minerals are dominantly structurally-controlled, with most mineralization occurr ........
Mining Methods
Truck & Shovel / Loader
Summary:
The La Arena operation has been mining the oxide deposit at the La Arena Mine since 2011. The operation is a conventional drill, blast, shovel and truck open pit run-of-mine (ROM) operation. Mining is carried out on two 12-hour shifts, operating 7 days a week under an alliance style contract with Peruvian contractors. The oxide ore is hauled directly from the pit to the leach facility or to stockpiles.
The La Arena Mine Calaorco open pit is mined by conventional truck and shovel methods. The mining fleet consists of 90 tonne class rock trucks and 10 m3 hydraulic shovels. Blasthole drilling is performed by diesel powered rotary single pass track drills.
The bench height is 8 meters. Double benching is applied with a catch bench 11 meters wide in sandstone and 12 meters wide in porphyry. Inter-ramp wall angles are 43.5° in sandstone and 37.0° in porphyry.
Ramps are constructed 25 meters wide including berms and ditches. Leach ore is direct hauled to the leach facility or to ore stockpiles.
All waste material is hauled to the waste rock storage facility located south of the Calaorco pit. Non-Acid-Generating (NAG) waste is used to encapsulate the Potentially Acid Generating (PAG) waste.
Crushing and Grinding
Processing
Flow Sheet:
Summary:
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Water Supply
Source:
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Production
:
Commodity
Units
2024
2023
2022
2021
2020
2019
2018
Gold
koz
......
^
......
......
......
......
......
149
Silver
koz
......
......
......
......
......
All production numbers are expressed as metal in doré.
^ Guidance / Forecast.
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Operational Metrics:
Metrics
2023
2022
2021
2020
2019
Ore tonnes mined
......
......
......
Waste
......
......
......
......
Tonnes processed
......
......
......
......
11,190 kt
Daily processing capacity
......
......
......
......
Stripping / waste ratio
......
......
......
......
Total tonnes mined
......
......
......
......
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Reserves at June 30, 2023:
Category
Tonnage
Commodity
Grade
Contained Metal
Proven
15.1 Mt
Gold
0.38 g/t
183.4 koz
Probable
17.5 Mt
Gold
0.28 g/t
159.7 koz
Measured
1.2 Mt
Gold
0.25 g/t
9.5 koz
Indicated
2.1 Mt
Gold
0.16 g/t
11.1 koz
Inferred
5.8 Mt
Gold
0.23 g/t
43.4 koz
Commodity Production Costs:
Commodity
Units
2024
2023
2022
2021
2020
2019
Cash costs (sold)
Gold
USD
......
......
......
......
......
......
Total cash costs
Gold
USD
Total cash costs
Gold
USD
All-in sustaining costs (sold)
Gold
USD
......
......
......
......
......
......
All-in sustaining costs (AISC)
Gold
USD
^ Guidance / Forecast.
†
Net of By-Product.
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Operating Costs:
Units
2017
OP mining costs ($/t mined)
USD
5.42
Processing costs ($/t milled)
USD
......
Total operating costs ($/t milled)
USD
......
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Financials:
Units
2024
2023
2022
2021
2020
2019
2017
Capital expenditures (planned)
M USD
......
Capital expenditures
M USD
......
......
......
......
......
32
Sustaining costs
M USD
......
......
......
......
......
32
Revenue
M USD
......
......
......
......
......
233.8
Operating Income
M USD
......
......
......
......
......
59.3
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Heavy Mobile Equipment as of January 1, 2018:
HME Type
Model
Size
Quantity
Leased or
Contractor
Dozer (crawler)
.......................
.......................
Dozer (crawler)
.......................
.......................
Dozer (rubber tire)
.......................
.......................
Drill (blasthole)
.......................
.......................
Grader
.......................
.......................
Loader
.......................
.......................
Shovel
.......................
.......................
Truck (fuel / lube)
5000 gallons
.......................
Truck (haul)
.......................
90 t
.......................
Truck (water)
.......................
.......................
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Mine Management:
Job Title
Name
Profile
Ref. Date
.......................
.......................
Apr 11, 2024
.......................
.......................
Apr 11, 2024
.......................
.......................
Apr 11, 2024
.......................
.......................
Apr 11, 2024
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Staff:
Employees
Contractors
Year
2022
2021
2015
Corporate Filings & Presentations:
Document
Year
...................................
2023
...................................
2023
...................................
2023
...................................
2023
...................................
2022
...................................
2022
...................................
2022
...................................
2022
Annual Information Form
2021
Annual Report
2021
Corporate Presentation
2021
Sustainability Report
2021
Annual Information Form
2020
Annual Report
2020
Press Release
2020
Annual Information Form
2019
Annual Report
2019
Year-end Mineral Reserves
2019
Management Discussion & Analysis
2018
Press Release
2018
Technical Report
2018
Year-end Mineral Reserves
2018
Annual Information Form
2017
Financial Review
2017
Management Discussion & Analysis
2017
Press Release
2017
Annual Information Form
2016
Corporate Presentation
2016
Financial Review
2016
Management Discussion & Analysis
2016
Annual Information Form
2015
Financial Review
2015
Management Discussion & Analysis
2015
Press Release
2015
Technical Report
2015
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